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aggregated_listener.go
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/
aggregated_listener.go
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// Copyright 2023 jim.zoumo@gmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package netutil
import (
"errors"
"fmt"
"net"
"sync"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
)
var (
ErrAccecptClosed = &net.OpError{Op: "accept", Err: fmt.Errorf("use of closed network connection")}
ErrNoEnoughListeners = errors.New("must supply at least two listeners")
)
// AggregatedListener is a listener aggregated by other listeners in
// order to satisfy net.Listener interface.
//
// It makes http server can accept connections from several listeners in the
// meanwhile.
type AggregatedListener interface {
net.Listener
// Addrs returns all listeners' network addresses.
Addrs() []net.Addr
// TCPAddrs returns all tcp listeners' network addresses.
TCPAddrs() []*net.TCPAddr
// UnixAddrs returns all unix listeners' network addresses.
UnixAddrs() []*net.UnixAddr
// AcceptTCP accepts the next tcp incoming call and returns the new
// tcp connection.
AcceptTCP() (*net.TCPConn, error)
// AcceptUnix accepts the next unix incoming call and returns the new
// unix connection.
AcceptUnix() (*net.UnixConn, error)
}
// TCPListener represent a tcp listener
type TCPListener interface {
net.Listener
// AcceptTCP accepts the next tcp incoming call and returns the new
// tcp connection.
AcceptTCP() (*net.TCPConn, error)
}
// UnixListener represent a unix listener
type UnixListener interface {
net.Listener
// AcceptUnix accepts the next unix incoming call and returns the new
// unix connection.
AcceptUnix() (*net.UnixConn, error)
}
type acceptResult struct {
conn net.Conn
err error
}
type aggregatedListener struct {
major net.Listener
acceptC chan *acceptResult
acceptTCPC chan *acceptResult
acceptUnixC chan *acceptResult
tcpLns []TCPListener
unixLns []UnixListener
lns []net.Listener
closeOnce sync.Once
closeAcceptC chan struct{}
closeC chan struct{}
}
// NewAggregatedListener aggregate all input listeners into one to
// satisfy net.Listener interface.
//
// Must supply at least two listeners.
//
// It takes the first listener as major to expose the address and
// accepts all listeners on background to get network connections.
func NewAggregatedListener(listeners ...net.Listener) (AggregatedListener, error) {
if len(listeners) < 2 {
return nil, ErrNoEnoughListeners
}
l := &aggregatedListener{
acceptC: make(chan *acceptResult),
acceptTCPC: make(chan *acceptResult),
acceptUnixC: make(chan *acceptResult),
closeC: make(chan struct{}),
closeAcceptC: make(chan struct{}),
major: listeners[0],
}
for i := range listeners {
switch ln := listeners[i].(type) {
case TCPListener:
l.tcpLns = append(l.tcpLns, ln)
case UnixListener:
l.unixLns = append(l.unixLns, ln)
default:
l.lns = append(l.lns, ln)
}
}
l.acceptBackgroup()
return l, nil
}
func (l *aggregatedListener) acceptBackgroup() {
wg := sync.WaitGroup{}
for i := range l.lns {
ll := l.lns[i]
wg.Add(1)
go func() {
l.acceptFromListener(ll, l.acceptC)
wg.Done()
}()
}
for i := range l.tcpLns {
ll := l.tcpLns[i]
wg.Add(1)
go func() {
l.acceptFromListener(ll, l.acceptTCPC)
wg.Done()
}()
}
for i := range l.unixLns {
ll := l.unixLns[i]
wg.Add(1)
go func() {
l.acceptFromListener(ll, l.acceptUnixC)
wg.Done()
}()
}
go func() {
wg.Wait()
// close channel after all listener accecpt goroutine stopped
close(l.closeC)
}()
}
func (l *aggregatedListener) acceptFromListener(ln net.Listener, resultChan chan<- *acceptResult) {
for {
conn, err := ln.Accept()
needBreak := false
if err != nil {
needBreak = true
if nerr, ok := err.(net.Error); ok && nerr.Temporary() {
needBreak = false
}
}
select {
case resultChan <- &acceptResult{conn, err}:
if needBreak {
return
}
case <-l.closeAcceptC:
return
}
}
}
// AcceptTCP accepts the next tcp incoming call and returns the new
// tcp connection.
func (l *aggregatedListener) AcceptTCP() (*net.TCPConn, error) {
select {
case result := <-l.acceptTCPC:
if result.err != nil {
return nil, result.err
}
return result.conn.(*net.TCPConn), nil
case <-l.closeC:
return nil, ErrAccecptClosed
}
}
// AcceptUnix accepts the next unix incoming call and returns the new
// unix connection.
func (l *aggregatedListener) AcceptUnix() (*net.UnixConn, error) {
select {
case result := <-l.acceptUnixC:
if result.err != nil {
return nil, result.err
}
return result.conn.(*net.UnixConn), nil
case <-l.closeC:
return nil, ErrAccecptClosed
}
}
// Accept implements the Accept method in the Listener interface; it
// waits for the next call and returns a generic Conn.
func (l *aggregatedListener) Accept() (net.Conn, error) {
var result *acceptResult
select {
case result = <-l.acceptC:
case result = <-l.acceptTCPC:
case result = <-l.acceptUnixC:
case <-l.closeC:
return nil, ErrAccecptClosed
}
return result.conn, result.err
}
func (l *aggregatedListener) Addr() net.Addr {
return l.major.Addr()
}
func (l *aggregatedListener) Close() error {
var closeErr error
l.closeOnce.Do(func() {
var errors []error
for _, ln := range l.lns {
if err := ln.Close(); err != nil {
errors = append(errors, err)
}
}
for _, ln := range l.tcpLns {
if err := ln.Close(); err != nil {
errors = append(errors, err)
}
}
for _, ln := range l.unixLns {
if err := ln.Close(); err != nil {
errors = append(errors, err)
}
}
closeErr = utilerrors.NewAggregate(errors)
close(l.closeAcceptC)
})
return closeErr
}
// Addrs returns all listeners' network addresses.
func (l *aggregatedListener) Addrs() []net.Addr {
var addrs []net.Addr
for _, ln := range l.lns {
addrs = append(addrs, ln.Addr())
}
for _, ln := range l.tcpLns {
addrs = append(addrs, ln.Addr())
}
for _, ln := range l.unixLns {
addrs = append(addrs, ln.Addr())
}
return addrs
}
// TCPAddrs returns all tcp listeners' network addresses.
func (l *aggregatedListener) TCPAddrs() []*net.TCPAddr {
var addrs []*net.TCPAddr
for _, ln := range l.tcpLns {
addrs = append(addrs, ln.Addr().(*net.TCPAddr))
}
return addrs
}
// UnixAddrs returns all unix listeners' network addresses.
func (l *aggregatedListener) UnixAddrs() []*net.UnixAddr {
var addrs []*net.UnixAddr
for _, ln := range l.tcpLns {
addrs = append(addrs, ln.Addr().(*net.UnixAddr))
}
return addrs
}